JPS6044789A - Refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of Application The present invention d: For example, a refrigerator, etc., in which a temperature detection unit is provided in a part of the refrigerator and the ON-OFF state of a compressor in a refrigeration cycle is controlled by double-voltage. refrigeration equipment.

The structure of the conventional example and its problems The conventional example will be explained with reference to FIGS. 1 and 2. Reference numeral 1 denotes a refrigerator body, which is divided by a partition wall 2 into a freezer compartment 3 at the top and a refrigerator compartment 4 at the bottom. 5 is a compressor of the refrigeration cycle. Reference numeral 6 indicates a cooler for the refrigeration cycle, and reference numeral 7 indicates a blower for forced ventilation, both of which are installed within the partition wall 2. 8 is a temperature detection unit (hereinafter referred to as a thermistor 8 for +-1t), which is connected to the compressor 6.
Detects the temperature that turns ON-OFF. ! A damper thermostat 9 is provided at the entrance of the refrigerator compartment 7 to adjust the amount of cold air inflow. Next, to explain the electric circuit, the compressor 6 is connected in parallel with the blower 7, and then the relay 1
It is connected to the power supply via o. 11 is a temperature control device including a thermistor 8, resistors R1, R2°R3, R4, R6,
It consists of a comparator 12.
The output is a driver circuit such as a transistor (not shown)
The relay 10 is connected to be turned ON and OFF via the relay 10.

In such a configuration, when the temperature inside the refrigerator is high, the resistance value of the thermistor 8 becomes small and the temperature control device 1
The potential at point A determined by RTH and R1 of resistor R
2, R3, and R4, and the output of the comparator 12 becomes "H", so the relay 10
is turned on via a driver circuit such as a transistor (not shown), and the compressor 5. When the blower 7 is in operation 1 to 1, the cold air generated in the cooler 6 of the refrigeration cycle is transferred to the freezer compartment 3. A forced wind blows into the refrigerator compartment 4 and begins cooling the inside of each rif.
The resistance value of the thermistor 8 also increases, and the potential at point A compared with that at point B decreases to form a differential, so cooling by one inch is continued. After that, the inside of the refrigerator is cooled down to a certain temperature)
l, lq are →J--The resistance value RTH of mister 8 increases and the potential A becomes smaller than the potential at point B, so the 114 force of the comparator 12 becomes 1L'' and turns the relay 10 off.
F compressor 5. The blower 7 is stopped. At the same time, the resistance value of the thermistor 8 also decreases, and the potential at point A is immediately switched to the potential to form a differential, and the stopped state continues as it is. Thereafter, this action is repeated to perform the normal cooling action.

However, in actual use, such as when the door is frequently opened and closed, such a control method is often wasteful and may result in inefficient operation control. In other words, although there are various types of foods stored, this is represented by the temperature change of the temperature detection unit 11 such as a thermistor installed in a part of the refrigerator. Normally, in order to sensitively detect the door opening/closing and the heat load inside the refrigerator, they are located in a position where they are easy to detect, or they are configured to have a heat capacity that is relatively easy to detect. As shown in the figure, in cases where the door is frequently opened and closed, even if the food inside is kept at a sufficiently low temperature for its own heat capacity, the temperature detection unit 11 detects the temperature each time the door is opened and closed. Detected 1
However, it is difficult to reach the predetermined temperature t2 at which a command to stop the compressor is issued, and the temperature is maintained at a temperature slightly higher than the stop command temperature. However, it has the drawback of being lenient in terms of power saving and resulting in inefficient control.

[1] In view of the above points, it is an object of the present invention to prevent unnecessary continuation of cooling operation during high loads such as when doors are frequently opened and closed.

Structure of the Invention In order to achieve this object, the present invention provides an O
Another base temperature is set at a temperature slightly higher than the FF temperature, and if the temperature remains below this base temperature for a predetermined period of time, a command is issued forcibly to open/close the IF compressor. Prevents unnecessary continuation of cooling operation when the load is 11
- to do.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 3, 4, 5, and 5. Incidentally, the same parts as those in the prior art are denoted by the same reference numerals, and the description thereof will be omitted. In the figure, 11' is a temperature control device, and the normal temperature control section is the resistance value RT of the thermistor 8.
H9 resistance R1, R2, R3゜R4, R6 comparator 1
If the potential at point A determined by resistors RTH and R1 of thermistor 8 is higher than the potential at point B determined by resistors R2, R3, and R4, the output of comparator 12 becomes "H°". , conversely, the potential at point A is resistor R2,
The output of the comparator 9 is set to be "L" when the potential is lower than the potential at point B determined by R3, R4 and R5. Another temperature control section includes the resistor RTH1 of the thermistor 8, resistors R1, R6, R7, seven comparators,
- It is composed of a relay 13, and the potential at the point A is the resistance T (
If the potential is higher than the zero point potential determined by R7, the output is "H", and if it is lower, the output is "L". 4
: It is composed of J9. However, in this case, the potential at point C is set 1r, t, r, and the potential at point B is preset at a slightly higher level. That is, the output of the comparator 12 is then directly connected to the AND circuit 14, and the output of the comparator 13 is converted by the inverter 15 and connected to the timer 16. timer 16
is configured to generate an output signal "H" only when the time when the input side is "HI+" has been accumulated l~, and the integration of a predetermined time T has been completed.

Resetting is performed by inputting the "L" signal to the input side.The output of the timer 16 is connected to the other input of the AND circuit 14 via the inverter 17, and
The relay 1o is configured to turn on and off according to the output of the circuit 14.

Reference numeral 16' denotes an auxiliary stop device that stops the compressor 5 after a predetermined time T has elapsed since the temperature remains below the reference temperature.

Next, the operating situation in this configuration will be explained with reference to FIG. In a normal stable operation state without any change, when the temperature of the thermistor 8 installed in the refrigerator rises by an inch to the predetermined value t1, the resistance value RTH of the thermistor 8 and the resistance R
1, the potential at point A determined by resistors R2, R3, R4
Comparator 1 becomes higher than the potential of point B determined by
The output of comparator 13 becomes H"'. At the same time, the potential of point A exceeds the potential of point 0, so the output of comparator 13 also becomes n.
However, the output of the timer 16 is "L", which is converted to "Hn" by the inverter 17, so that both inputs of the AND circuit 14 become "H". becomes, AND
The output of circuit 14 becomes “H” and relay 1o turns on.
, compressor6. The blower 7 is operated to cool the inside of the refrigerator. After that→)--The temperature of Mister 8 decreases to the predetermined value t2℃1
7, the resistance value RTH of thermistor 8 and resistance R1
9-: When the potential at point A determined by resistors R2, R3, R4, and R5 becomes lower than the potential at point B determined by resistors R2, R3, R4, and R5, and the output of comparator 12 becomes "LI+," the output of AND circuit 14 becomes L″
', the relay 10 is turned off and the compressor 5 and blower 7 are stopped. In this case, from the potential of point B mentioned above, the resistance R
6, the potential of the 0 point determined by R7 is set to a slightly higher value of 1, and the potential of comparator 13 is higher than that of comparator 12.
The output W L I+ is generated earlier, but the AND circuit 1 is output only after the timer 16 has integrated the predetermined time T.
Since the "L" signal is not sent to 4, the output of comparator 12 becomes °゛L'' during that time, turning relay 10 OFF.
Take the initiative to do F. In this way, normal cooling operation is repeated.

Next, during cooling operation, if the door is opened and closed frequently, the temperature drop gradient of the thermistor 8 is gentle and the predetermined temperature is 12°C.
Although it is difficult to reach the standard temperature of 13℃, which is slightly higher than the separately determined 12℃, the potential at point A becomes lower than the potential at point 0, and the output of comparator 13 becomes 1゛L.
", and the inverter 1° is converted to "H" by the overnight 16, and the timer 16 starts integrating the time. After that, the temperature of the thermistor 8 increases to 12°C.
Even if T has not yet been reached, when the timer 16 completes the integration of the predetermined time T, an output of "H" is generated, which is converted to "L" by the inverter 17, and the output of the AND circuit 14 is set to "L" to turn off the relay 10. Since the compressor 5 and blower 7 are stopped, as shown in Fig. 3, the supercooling area shown by diagonal lines as in the conventional example is almost eliminated, and if cooling continues even though the food is sufficiently cooled. This means that there is no waste and efficient cooling can be performed.

Effects of the Invention As is clear from the above explanation, the present invention provides an ON temperature for turning on the compressor of a refrigeration cycle, an OFF temperature for turning off the compressor, and another reference temperature slightly higher than the OFF temperature. This temperature control device is configured to issue a command to turn off the compressor even if the OFF temperature has not been reached if the condition below this reference temperature continues for a predetermined time or more. Opening and closing frequently1
In cases such as when one step is missed, the temperature drop gradient of the temperature detection part is gradual, and it is difficult to reach the predetermined compressor OFF temperature at 1, and it is maintained just before that for a long time. A command to forcibly turn off the compressor can be issued, so even if the food is sufficiently cooled, it will not continue cooling unnecessarily and cause overcooling, eliminating unnecessary cooling operations.
It has been put to practical use in terms of power saving since then.The effect is extremely high.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of a refrigerator showing a conventional example, FIG. 2 is a control circuit diagram thereof, FIG. 3 is a schematic sectional view of a refrigerator showing an embodiment of the present invention, and FIG. 4 is a control circuit diagram thereof. FIG. 5 is a temperature characteristic diagram. 6...Compressor, 11'...Temperature control device, 16'...Auxiliary stop device. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure! / Figure 3 /

Claims (1)

[Claims] Inside the warehouse? The ON temperature that turns on the compressor of the refrigeration cycle by detecting -1-Y7 of l'r degree and the OFF temperature that turns off the compressor by detecting a drop in the temperature inside the refrigerator and this OF
A temperature control device outputs a signal at another reference temperature set slightly higher than the F temperature, and turns off the compressor even if the state below the reference temperature continues for a predetermined period of time.
A refrigeration system equipped with an auxiliary stop device.